50 C.F.R. § 222.401
Any United States fishing vessel, either commercial or recreational, which operates within the territorial seas or exclusive economic zone of the United States or on the high seas, or any fishing vessel that is otherwise subject to the jurisdiction of the United States, operating in a fishery that is identified through the annual determination process specified in § 222.402 must carry aboard a NMFS-approved observer upon request by the NMFS Assistant Administrator, in consultation with NMFS Regional Administrators and Science Center Directors, as appropriate. NMFS and/or interested cooperating entities will pay direct costs for the observer. Owners and operators must comply with observer safety requirements specified at 50 CFR 600.725 and 50 CFR 600.746 and the terms and conditions specified in the written notification.
50 C.F.R. §222.401